Ph. D thesis at the faculty of Science at the University of Basraha (Assessment the effect of sleeve gastrectomy on liver functions and some gastrointestinal hormones), and showed the researcher's thesis (Rafida M.AL-Amiri). Thesis aims to evaluate the changes of body mass index and the physiological and metabolic changes of liver after sleeve gastrectomy, and investigate the effect of surgery on the level of some of metabolic hormones for patients with morbid obesity and concluded that there was a significant decrease in BMI and a significant increase in TSB and that there was a significant decrease in the levels of the liver enzymes ALT and AST, as well as ALP, a significant increase in the measurement of PT, INR, and a significant decrease in the levels of ghrelin, leptin, and GLP-1. The results of histological observation also indicated that the latest study indicated the normal histological structure of the stomach, and recommended, to perform liver function tests and coagulation profile before surgery and follow-up. Conduct in-depth future research to focus on changes that happen in Ghrelin, Leptin, and GLP-1 for longer duration [possibly more than one year].